There was still about 7 blocks available last night on SeeTickets, so I think if you rang the actual stadium you will probably be able to get some tickets. I assume SeeTickets and Ticketmaster have just ran out of their allocation or something
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City Of Manchester Stadium 4.6.2006, City of Manchester Stadium 22.6.2008, Bristol Ashton Gate Stadium 25.6.2008, O2 Arena 13.6.2010, Manchester L.C.C.C 24.6.2011, City of Manchester Stadium 8.6.2013